<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let p1 = new Promise((resolve, reject) => {
            setTimeout(() => {
                resolve('1111');
            },2000)
        })
        let p2 = new Promise((resolve, reject) => {
            setTimeout(() => {
                resolve('2222');
                // reject('222')
            },1000)
        })
        let p3 = new Promise((resolve, reject) => {
            setTimeout(() => {
                resolve('3333');
            },3000)
        })
        Promise.all([p1, p2, p3]).then(res => {
            console.log(res);
        },err => {
            console.log(err, '原生');
        })
        // all方法的实现
        let arr = [p1, p2, p3];
        let newArr = [];
        let count = 0;
        function myAll(arr) {
            return new Promise((resolve, reject) => {
                arr.forEach(p => {
                    p.then(res=> {
                        newArr.push(res);
                        count++;
                        if(count>= arr.length) {
                            resolve(newArr)
                        }
                    },err => {
                        reject(err);
                        console.log(err,'own');
                    })
                }) 
            })
        }
        myAll(arr).then(res => {
            console.log(res);
        },err => {
            console.log(err,'自己');
        });
    </script>
</body>
</html>